Siemens BQ3B020 - 20 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQ3B020 is a 20A, 240V, 3-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit protection in panelboards and load centers. Built for residential, commercial, and light industrial environments, it pairs solid protection with a robust mounting design that keeps connections secure even in vibration-prone spaces.

• Secure bolt-on mounting ensures a rigid, vibration-resistant bus connection that stays tight through compressor cycles, door closures, and busy electrical rooms.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining thermal overload sensing with magnetic instantaneous trip for short-circuit events, reducing nuisance trips and improving reliability.
• Three-pole design protects all three conductors in a 3-phase or 3-wire system, delivering synchronized interruption across the protected circuit.
• 20A at 240V capability is ideal for typical branch circuits in panelboards and load centers that require precise current limitation without sacrificing safety.
• OEM-compatible engineered to integrate with matching Siemens OEM load centers and panelboards, ensuring fitment without compatibility surprises.
• Versatile application suited for homes, small-to-medium commercial spaces, and light industrial installations where compact, reliable overcurrent protection is essential.

Why this matters

When panel reliability and fault protection are priorities, the BQ3B020’s bolt-on design minimizes loose connections caused by vibration, movement, or frequent panel service. The dual-mode trip unit helps protect wiring and devices from damage during overloads while sharply interrupting faults, so downstream equipment and occupants stay safer and downtime is minimized.

Technical snapshot

• Manufacturer: Siemens
• Part Number: BQ3B020
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Whether you're upgrading an existing panel or building out a new electrical setup, the Siemens BQ3B020 provides precise protection, durable mounting, and seamless compatibility with Siemens load centers. It’s a thoughtful choice for dependable, long-term performance in demanding electrical environments.